Alkermes plc. — Director's Dealing 2012

Apr 30, 2012

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Alkermes plc. (ALKS)
CIK: 0001520262
Period of Report: 2012-04-26

Reporting Person: BLOOM FLOYD E (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2012-04-26	Common Stock	P	20000	$17.5914	Acquired	90281	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	9028	Indirect
Common Stock	21066	Indirect

Footnotes

F1: The reporting person's purchase of Alkermes plc ordinary shares reported herein was made pursuant to a Rule 10b5-1 trading plan adopted by the reporting person and was inadvertently effected one day prior to the expiry of the six-month holding period mandated under Section 16(b) of the Securities Exchange Act of 1934. This purchase is matchable to the reporting person's sale of the same number of shares on October 28, 2011. The reporting person and Alkermes plc have entered into an agreement under which the reporting person has paid Alkermes plc the full amount of the profit realized in connection with the short-swing transaction, less transaction costs.

F2: The price reported in Column 4 is a weighted average price. The shares were purchased in multiple transactions at prices ranging from $17.47 to $17.93. Full information regarding the number of shares purchased at each separate price can be furnished to the SEC staff upon request.